Pitman connector bar



June 17, 1941. w. P. HANDKE PITMAN CONNECTOR BAR Filed March 25, 1940 www W A www A I'TORNEYS Patented June l?, 194i Plll CONNECTQR BAR Walter P. Handke, Dunlap, iowa Application March 25, 19M, Serial Ne. 325,334?

(Cl. 'M -586) 3 Claims.

This invention relates to improvements in pitnian connectors and especially is concerned with Y a novel longitudinally adjustable connector of the mentioned type.

Frequently in constructing pitman connections between machines it is desirable to alter the ratio of energy translation from reciprocating to rotating motion or vice versa and for this purpose a long felt industrial want has been experienced for an adjustable connector bar to be used in linking a pitman wheel with a pitman rod. Attempts to satisfy this want have heretofore been unsuccessful in that no means has been provided for easily and conveniently effecting the nicety of adjustment required while withal preserving the ruggedness, stability and dynamic balance necessary in a pitman connection.

t is among the more important objects of this invention to satisfy' the industrial want referred to above by providing a rugged dynamically balanced easily adjustable longitudinally extensible pitman connector which can be adapted to existing machinery by simple replacement of the pitman bar.

Another object of this invention is to provide a novel means for facilitating precise and minute adjustment on the effective length of. a pitman bar without impairment of the ruggedness or useful life of the structure as compared with bars of the nonadjustable type.

An advantage of the type of adjustment permitted in a connector bar according to the present invention is that safeguards are included for permitting use of wooden bars which, in many instances such as in the construction of farm machinery, well drilling and the like, is highly desirable from many standpcints.

Noteworthy among the features of the novel bar according to the present invention are its simplicity and ruggedness of construction7 the former suiting the device to the requirements of manufacture under conditions of mass production and the latter assuring long useful life.

Other objects, advantages and features of the new and improved pitman connector bar according tothe present invention will be apparent to those skilled in this art during the course of the following description.

Regarded in certain of its broader aspects the present invention comprises a longitudinally adjustable extensible pitman bar.

In order to facilitate a fuller and more complete understanding of the present invention a specific embodiment thereof herein illustrated will be hereinafter described, it being clearly understood, however, that the illustrated embodiment, although presently preferred, is provided solely by way vof example of the practice of this invention and not by way of limitation thereof except insofar the invention is recited in the subjoined claims.

Referring then to the drawing,

Figure l is substantially a top plan View of a portion a pitrnan bar embodying the present invention showing same associated with a pitman bearing, the latter being illustrated in cross-seotional view,

2 is essentially a vertical sectional view of Fig. l talren along the line 2--2 thereof,

Figrr 3 is substantially a transverse vertical sectional view of Fig. 2 taken along the line 3 3 thereof, and

Fig. 4 is substantially1 a perspective view of one of the sheath end caps.

The drawing illustrates the connection of an end of a pitman connectorY bar A through a link B and bearing generally designated by the reference character C with a pitman wrist pin D. It is to be noticed that the end of the bar A is sltted to provide a bifurcated member having parallel elements lt and l l defining a void therebetween within which is positioned a lug-like formation i2 of the link B.

Sheath-like caps I3 and lil formed integrally with bars l5 and it positioned alongside the elements lil and l l serve protectively to .cover said element ends substantially as shown. The caps fit snugly over the element ends and serve to prevent splitting or other deleterious effects resulting from excessive strain. The top portion I'l of the lug-like member l2 is provided with serrations presenting upstanding teeth i3 essentially as shown. An envelope member I9 having openings lSa formed in the top thereof registering and engaging with the teeth i8 is positionable circumjacent the member l2 substantially as shown, the sides of the envelope extending against the sides of the members Il and I2 and engage the edges of the caps I3 and i4. A plurality of longitudinally extending slot-like openings 2 formed in the member l2 are arranged in spaced relation in a manner such that the axis of the openings extend in a common direction and registering circular openings are formed in the sides of the envelope member lll spaced with respect to each other such that the centers of the circular openings are registerable upon occasion with the centers of. the slot-like openings 2l) under which conditions the teeth i8 extend through the openings lila formed in the top of the envelope I9.

Bolts 2| extend through the openings formed in the lug-like member I2 and in the envelope I9 passing also through openings 22 in the side pieces I5 and I6 and nuts 23 are receivable upon the ends of the bolts to facilitate holding the parts in the selected assembly.

It will be -apparent from the foregoing that the veffective length of the pitman connector bar can be altered When assembling the bar end A and link B by adjusting the teeth I8 Within the openings Illa in the top of the envelope I9 since in this manner the centers of the circular openings formed in the sides of the envelope can be shifted with respect to the centers of the slots 2D formed in the lug-like member I2. When adjusted to suit the conditions of Work the nuts 23 on the bolts v2| can be fixed in locked position by cotter pins 23a in openings in the bolt end substantially as shown.

The pitman bearings generally designated by the reference character C comprises, it will be noticed, a pair of similar cases 30 and 3| mounted upon the connector link B by bolts 32 and nuts 33. Within the cases 30 and 3| are positioned external races 34 and 35 Within separate series of rollers 36 and 3l feeding into internal races 38 and 39 which are mounted upon an end portion 40 of the pitman Wrist pin D. The internal races 38 and 39 are held upon the wrist pin by a nut 4I locked in place With a cotter pin 42, the nut pressing through a series of shims 43 against the internal races which in turn press against a sleeve 44 abutting against a shoulder 45, formed on the Wrist pin- Covers 46 and 41 engaging with the open ends of the casings 30 and 3| are provided to confine lubricant to the interior of the casing through facilitating proper lubrication of the bearing. A closure member 48 received in a tapped opening formed in the cap 46 is provided to permit change, addition or removal of lubricant as conditions may require.

It is to be understood that this invention is capable of extended application and is not confined to the precise illustrated forms nor described construction and, therefore, such changes and modifications may be made therein as do not affect the spirit of the invention nor exceed the scope of theappended claims.

Having thus described the present invention, what it is desired to secure by Letters Patent is:

l. A pitman connector, comprising a bar longitudinally slitted at one end and forming a pitman, a link extending Within the slitted end of the bar and having elongated slots therein, an envelope straddling the link Within the slit and having openings registering With the slots, interlocking means between the link and the envelope, and transverse bolts passing through the slitted end of the bar and through the envelope and the slots in the link.

2. A pitman connector, comprising a bar longitudinally slitted at one end and forming a pitman, a link extending Within the slitted end of the bar and having elongated alined slots therein, teeth carried by the upper edge of the link, an envelope straddling the link Within the slit and having openings in its upper looped edge adapted to receive the teeth, and transverse bolts passing through openings in the slitted end of the bar and through openings in the envelope and the slots in the link.

3. A pitman connector, comprising a longitudinally slitted bar forming a pitman, a link extending Within the slitted end of thebar and having a series of alined elongated transverse slots therein, a series of rectangular projections carried by the upper edge of the link, an envelope straddling the link within the slitted end of the bar and having a series of rectangular openings therein of a greater number than the projections on the link and through which the projections extend, and transverse bolts passing through the slitted end of the bar and through the openings in the envelope and the slots in the link.

` WALTER P. HANDKE. 

